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An advantage of James Watt's steam engine was that it was significantly more efficient than the Newcomen steam engine that came before it. Watt introduced several key improvements to the design of the steam engine that allowed it to use less fuel and do more work.
One of Watt's crucial improvements was the separate condenser. In the Newcomen engine, steam was condensed inside the cylinder, which then had to be reheated. Watt's design took the condensation process outside of the cylinder, which kept the cylinder hot at all times, saving energy that would have otherwise been used to reheat it.
Another important feature of Watt's engine was the introduction of a rotary motion. Earlier steam engines were typically used for pumping water and provided only an up-and-down (reciprocating) motion. Watt's design could turn a wheel, opening up new possibilities for the use of steam power in factories and mills.
These innovations meant that his engines were more practical for a wider range of industrial uses and led to considerable fuel savings, reducing the cost of power, which was a huge advantage at the time and led to the widespread adoption of his steam engines, fueling the Industrial Revolution